20320100 has 36 divisors (see below), whose sum is σ = 46692324. Its totient is φ = 7649280.

The previous prime is 20320073. The next prime is 20320103. The reversal of 20320100 is 102302.

It can be written as a sum of positive squares in 6 ways, for example, as 1170724 + 19149376 = 1082^2 + 4376^2 .

It is not an unprimeable number, because it can be changed into a prime (20320103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4277 + ... + 7676.

It is an arithmetic number, because the mean of its divisors is an integer number (1297009).

Almost surely, 2^20320100 is an apocalyptic number.

20320100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320100 is an abundant number, since it is smaller than the sum of its proper divisors (26372224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20320100 is a wasteful number, since it uses less digits than its factorization.

20320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11984 (or 11977 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20320100 is about 4507.7821597766. The cubic root of 20320100 is about 272.8822455925.

Adding to 20320100 its reverse (102302), we get a palindrome (20422402).

The spelling of 20320100 in words is "twenty million, three hundred twenty thousand, one hundred".